Brake.



R. R. STEIN.

BRAKE.

APPLIUATION FILED MAY 14, 1908.

Patented Mar. 2, 1909.

witnesses rasierer ernten.

ROBERT R. STElN, 0F SEATTLE, WASINGTON.

' nt 9133er.

provements in Brakes, of Which the yfollow-` ing is a specification.

My invention has particular reference to a rotary brake.V

The primary object of the invention is to provide an improved self applying brake.

brake mechanism oi tl c A further object is the provision of a above type which shall be. under control tot: adjustment or application by auxiliary torce to obtain a desired braking effect under -varying conditions of speed.

Other objects and advantages Will be set forth as the description progresses and the features of novelty on which l desire pro tection 'defined in the claims.

In the accompanying drawing l have illustrated my invention in such form as now preferred by me.

With reference to `the drawing, wherein like reference numerals designate corrcspending parts throughout: Figure .1 is a side view of the invention in partial section showing the same applied to a car. Fig. 2 is a transverse sectionltaken on lino 2-2 oi F ig. 1, and Figs. 3 and 4 are fragmentary detail views.

In the present embodiment l have illustrated my invention applied directly to an axlel having secured thereto a track Wheel 2.v Mounted on axle 1 are supports, as 3,

each comprising a head 4 provided with op posits arms 5 which are svvingingly engaged with pivots 6 projecting laterally from axle 1 and secured thereto. Carried by the supports 3 are shoes as 7 leach having suitable connection with a respective support for out- Ward movement relatively thereto. ln the form of connection sho'vvn each shoe 7 is provided With stems 8 which are slidably engaged With adjacent head 4 and provided on their inner-end portions with collars 9 having screw threaded connection, each with a respective stern. Lyin-g about the stems -8 are coiled springs 10' which engage the collars 9 and heads 4 to yieldingly hold the shoes 7 from outward movement on the sup-- ports.

Connected with supports 3 l have shown a controlling means including' a Specication of Lettere Iiatent.

Application iled May 14, 1908. Serial 432,943.

:esteemed March a,l reos.

sleeve 12 slidably mounted on axleland. connected with said supportsby links 'as 11. This sleeve is held to rotation' with the'axle by means of a feather or the like and aengaged with a lever 14, fulcrumed at 14', byl means of a ring 15 which fits freely in an annular groove of said sleeve and carries suit!- able pins 16 engaging furcations of said lever.

Mounted on lever 14 is a catch 17 conveniently consisting of a flat spring normally engaging at one end with a quadrant 1S and suitably arranged -to yield and ride 'i the teeth of said quadrant When pressure is applied to lever 14 to swing the same in either direction. As it may be desired at tnn'os to release the controlling mechanism :trom quadrant 18 l preferably pivot catch 17 on lever 14 so that the cat-ch may be swung to disengaging position relatively to the quadrant as indicated in Fig. 4. Each shoe 7 is preferably formed with angularly disposedv bearing surfaces as 7', 7f which 'are related to braking surfaces 19, 20 respectively, the latter of which extends with the path of the shoes as they swing with supports 3 While the surface 19 extends across said path. These braking surfaces are con! voniently provided on a hemispherical cas` ing 21 secured to car'bodyl A and having sleeve 12 and axle l journaled in the Wall thereof. The normal position of the brake shoes and attendant` mechanism is indicated diagraminatically by broken lines '1n-Fig. 1.

Upon rotation of axle 1, centrifugal force tends to swing supports 3 outwardly 011 their pivots and also shift the shoes'7 outwardly on said supports. The catch', 17 is however, preferably' of suitable resistance to retain the supports in normal position up to a given rate' oispeed, while the springs 10, primarily placed under suitable tension by adjustment of the collars 9, yield to centrifugal torce of the shoes Tand permit 1 them to engage surface 19 when such'speed is reached and thereby obtain a braking effect automatically. Should the effect of the shoes 7 as thus applied fail to prevent further increment of speed, centrifugal angular adjustment of the shoe and a second surfaceY 20. If the braking effect thus -obtained fails to control the speed a greater resistance may be obtained by applying auxiliary force to lever 14. For example `the operator grasps lever 14 and presses the same in the roper direction to force the shoes 7 more rmly against-the braking 'surface 20.,A i

It will, be obvious that the controlling mechanism may be operated manually as desired to swing the supports 3 from normal position 'to ap ly the shoes 7 to surface 20, on to adjust t e said supports, as indicated by-bold lines in Fi 1, to carry the shoes 'Zin a Wider circle o revolution and thereby render the brake more sensitive. to obtain a braking eiiect automatically at comparatively low speed catch 1T is dis! 'engaged from quadrant 18 to release the i to carry the brake shoes against braking surcontrolling mechanism forfreer action of supports 3 responsively to centrifugal force `aceQOQf 1llaving thusl described my invention, what I claim as new, and desire to secure y Letters Patent of the United StatesV of America', is:

.1. brake comprising a rotatable ele- -ment, a .support movable therewith and adjustabl to various inclinations relatively to the :axis of'such element, means for yieldingly holding sai'd support yas adjusted, a shoe connected with said vsupport vfor out- .ward movement relatively thereto, and means angularly disposed braking surface ar- `rlatngled to oppose outward movement of said s oe.` v

3. A brake comprising a.. rotatable element, a support connected with said element to swing outwardly therefrom, a shoe movable outwardly on said support, and means provided with a braking surface arrangedl If desired provided with va braking surface extending.

to be engaged by said shoe and extending with the path of swinU thereof and a second braking surface extending across said path for engagement by said shoe.

4. A'brake comprising a rotatable eleface for co-action with said shoe extendingacross said path.

5.,A brake comprising a rotatable element, a support connected with said element to swing outwardly therefrom, fineaiis to yieldingly retain said 'support from swinging,ga` shoe movable outwardly on said support and yieldingly retained from so moving, and meansv provided with a braking sur5 face for co-action with said slice extend-ing with the path of swing of said support and a second braking surface for co-actioii with said shoe extending across said path.

(ixA brake 'comprising a rotatable ele ment, a support swingably connected with said element for angular adjustment relatively to the axis thereof, a controlling means connected with the support to adjustthe same, a shoe movable outwardly Onsaid element, and means provided with a braking surface for co-actio'n with said shoe extend* ing with the pathof swing of said support and a second braking surtace for co-action with said shoe extending across said path.

7. Anbrake comprising a rotatable element, a support connected to said element for movement therewith and for swinging outwardly therefrom, means for adjustably holding said support against swinging outwardly from said rotatable eleinent, a`shoe supported for outward movement on said suppoit,'niea1is yieldingly holding said shoe from outward movement on said support,

v'and means provided with a brakings'urface disposed to be engaged by said shoe during outward swinging of said su ip'ort.

Signed at Seattle, 'Washington vthis 6th day of May 1903.

ROBERT R. STEIN.

Witnesses:

ARLiiL-t ADAMS, FRANK E. ADAMS. 

